Changing the cartridge
Step One: Loosen the knob.
Step Two: Pull back the tray.
Step Three: Remove the knob on the handle side and place securely on the table. Don't misplace the nylon washer.
Step Four: Remove the cartridge by lifting up and away from the body.
Step Five: Place the new cartridge in position lining up the base and the handle so it fits squarely in the slot. Turn the handle to see if the cutters turn to verify it is seated correctly.
Step Six: Replace the knob on the handle side making sure to put the nylon washer over the screw before you tighten it. Push the tray back into position and tighten the knob. Cut wool!